Following her backstage fun with Ellez at The Wiltern this weekend, Kristen went to Lucky Strike to celebrate the 21st birthday of Twilight co-star Taylor!

Ashley Benson and Patrick Schwarzenegger were already in attendance when KStew showed up with a gaggle of friends.

One onlooker witnessed their interactions and reports:

"She was being fun and social, bowling and high-fiving. She and Taylor definitely seemed to be good friends and she was living it up. Taylor was super nice, very polite. Everyone was having a blast. Everyone was super into the bowling."